iPadOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-02-06T18:21:00Z. The update package is 268.27 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a5c98c1f2f82a3f69934eae08d14bb8a4e8e82f7.zip.